Safety attachment for elevator.



PATENTED JUNE 2,.1908

D. K. WALLINGFORD. SAFETY ATTACHMENT FOR ELEVATORS.

APPLICATION TILED AUG. 13. 1906.

INVENTOR QATMWAW ATTORNEY 35 supporting standards 4 and to the top which are i pawls 6 an entra n erases rarest ensues.

DANIEL K. WALLINGFORD, Ol INDIANAPGLIS,INDIANA.

SAFETY ATTACmENT FQR ELEVATQBS.

$pecification of Letters Patent.

' Patentedi'une 2, 1908.

' Application filed August 13, mos. Serial so. sconce.

To all whom it may concern;

Be itk nown that I, DANIEL K. WALLING- Form, a c tizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful improvements in Safety Attachments for Elevators, ofwhich the following is a specification, reference being bad therein attain these 0 jcots by means of the safety attachment illustrated in the accompanying drawings 111 which similar numerals of reference designate like parts throughout the severa'l views.

Figure 1. is a part broken sectionalelevational view of an elevator showing my invention of a safety attachment applied thereto, and, Fig. 2; is a transverse sectional view of the top beam portion of the elevator car.

The elevator car is composed of the floor 1 and the floor supporting uprights 2 which are securedto a suitable overhead beam 3.

To the ends of the beam 3 are bolted the pawl- (pivotally secured the depen ng 7 by suitable hinge-pins 8.

The elevating cables 9 and 10 of the ele vator car are connected to the ends of the horizontal arms of the bell-crank-levcrs 11 and'12, and the latterlcvcrs are hingcdly connected to and between the beams 13 by the hinge-pins 14. Suitable connecting rods 15 and 16 connect-the bottom ends of the depending lever arms of the said bell-crank levers 1-1 and 12 to the pawls 6 and 7.

Spring-rods 17 and'18 are connected at their outer ends to the pawls 6 and 7 at or near their bottom. ends, and the said rods are connected to a suitable spring or springs whereby they are moved outwardly to cause the pawls 6 and 7 to swing into engagement with their opposing rocks as hereinafter described. I prefer, however,.to use the spring mechanism illustrated in the drawing in which a central'spring thrust block 3.9

hingedly connected to and supported by the eye-bolt 20 and the hinge-pin 21.

The coils ring casings 22 are secured on the ends of i e spring thrust block 1%) in any suitable -manner to project horizontally and .out-

wardly therefrom. Coil springs, such as'the.

coil springs 23, are inclosed in the casings 22 and said coil springs surround the sprin rods Hand 18 and bear-at their inner ends against the thrust blocl z l9 and at their'euter ends against the collars 24 to force the spring rods 17 and 18 outwardly against theresist anceof the pawls 6 and 7 due to the tension on the cables 9 and 10.

Suitable rack guides 25 are secured in the shaft, or elevator way to extend vertically therein, and in these guides are fitted, to slide longitudinally therein the side racks 26 which are ada ted to be engaged by the pawls 6 and 7 w ien the latter are moved outwardlyinto their engaging positions. the bottom ends of the said racks 26 are core nected suitable air cylinder pistons '27 which are adapted to work in the air cushioning cyl inders 28, so that when the racks 26 are sud- 1 denly forced downwardly they move the pietons 27 in said air cylinders 28 to compress the air confined in said cylinders which operates as a yielding or elastic cushion,

' The pistons 27 and the racks 26 to'which they are connected are constantly main-- tained at their normal positions by suitable coil springs 29'when not actually influenced by the en agement of the en aging the racks 26.

lhc counter reactive s rings 29 therefore operate as they are intent ed to do, that is, as counter weights to support the racks and their pistons 27 in their normal positions at the. top ends of their cylinders 28, so that full.

advantage may be derived'from the compression of the air or other fluid in said cushioning cylinders 28 to absorb the force of a sudden shock due to a sudden a )plication of a load to said racks 26,as by a breaking of a cable.

The operation of this invention of a safety attachment for elevators I will now proceed to explain. i

Sup )osc the cables 9 and 10, to break or sever by any cause whatever, the-pawls 6 and -7 are immediately released and the spring rods 17 and 18, which are operated to move outwardly by their springs 23, as pre viousl y explained, cause the awls 6 and 7 to move outwardly to engage t is racks 26 and pawls (j and 7:

thereby apply the entire Weight of the elevator car and its mechanism connected to it to said racks 26 which latter immediately descend and force the air cylinder istons 27 downwardly into their air cylinders 28 to compress the air confined therein and thereby to operate as a yielding cushion to resist the force of the descending car with a 1nini- I mum amount of jar and the maximum safety.

a I clain1:-

'1. in. a safety device for elevators, the combination with the hoisting cables thereof, an elevator car, a pair of depending opposing pawls situated on opposin sides of said car, means connecting said cab es and said pawls .to retain the latter in normal disengaged position, spring rods connected at their outer ends to said pawls, coil springs surrounding said spring-rods, a thrust block situated hetween said springs, and a supporting eyebolt to which said spring thrust vblock is hingedly connected, of a pair of opposing racks situated in the vertical plane of travel of said pawls, slides wherein said racks are slidably supported, and an air cushioning e linder, situated to receive the thrust of said s idable racks.

2. In a safety device for elevators, the combination with the hoisting cables thereof, an elevator car, a pair of opposing depending pawls situated on opposing sides of said car, opposing bell-crank overs one of the lever arms of each-of which is connected to said cables, independent connecting rods conmeeting each one of said opposing pawls and said bell-crank lever-arms, spring rods connected at their outer ends one to each of said pawls, springs surrmlnding said rods, a

spring thrust blocksituatedbetween said springs and connected thereto, an eye-bolt to which said spring thrust-block is hingedly connected, and a coil spring, lnclosing casing secured on said, thrust block, 01' vertically extending rack guides situated adjacent to the sides of the elevator war directly opposite the pawls thereol', racks slidahly supported by said rack guides, pistons on the ends of said racks, aircushioning cylinders situated under the bottom ends or said racks wherein said pistons opcrate'to cushion the descent of the car, its contents, and the racks, and counterreactive springs situated within said cushioning cylinders and beneath the pistons thereof.

ln testimony whereof I al'iix my signature in presence of two witnesses. DANIEL ii. WALLINGFORD.

Witnesses:

THOMPSON It. BELL, G. W. KEEN. 

